Agardite

Agardite is a mineral group consisting of agardite-(Y), agardite-(Ce), agardite-(Nd), and agardite-(La). They comprise a group of minerals that are hydrous hydrated arsenates of rare-earth elements (REE) and copper, with the general chemical formula (REE,Ca)Cu₆(AsO₄)₃(OH)₆·3H₂O. Yttrium, cerium, neodymium, lanthanum, as well as trace to minor amounts of other REEs, are present in their structure. Agardite-(Y) is probably the most often found representative. They form needle-like yellow-green (variably hued) crystals in the hexagonal crystal system. Agardite minerals are a member of the mixite structure group, which has the general chemical formula Cu²⁺₆A(TO₄)₃(OH)₆·3H₂O, where A is a REE, Al, Ca, Pb, or Bi, and T is P or As. In addition to the four agardite minerals, the other members of the mixite mineral group are calciopetersite, goudeyite, mixite, petersite-(Ce), petersite-(Y), plumboagardite, and zálesíite.

Agardite-(Y) from the Bou Skour mine in Djebel Sarhro, Morocco was the first of the agardite-group minerals to be characterized. It was described by Dietrich in 1969 and was named after Jules Agard, a French geologist at the Bureau de Recherches Géologiques et Minières, Orléans, France. Agardite-group minerals have subsequently been found in Germany, Czech Republic, Greece, Italy, Japan, Namibia, Poland, Spain, Switzerland, the United Kingdom, and the United States.

See also

• List of minerals

References

Further reading

• Aufschluss 1977(5), 177–183.
• Steen, H. (2005): Ein Neufund von Agardit-(Y) aus Rotenbach im Feldberggebiet (südlicher Schwarzwald). Der Erzgräber 19, 70–72.
• Wittern: "Mineralfundorte in Deutschland", Schweizerbart (Stuttgart), 2001.*Wittern, A. (1995) Mineralien finden im Schwarzwald.
• Lapis 1985(11), 31–32.
• S. Weiss: "Mineralfundstellen, Deutschland West", Weise (Munich), 1990
• Walenta, K. and Theye, T. (2004): Agardit-(Ce) von der Grube Clara im mittleren Schwarzwald. Aufschluss 55, 17–23. [with analysis of Johann material showing Nd > La].
• Emser Hefte 15(3), 2–40 (1994).
• Heckmann, H. & Schertl, H.-P. (1990): Der Niederbergische Erzbergbau und seine Mineralien. Emser Hefte, 11 (2), 2–40.
• Pekov, I. V., Chukanov, N. V., Zadov, A. E., Voudouris, P., Magganas, A. and Katerinopoulos, A. (2010) Agardite-(Nd), IMA 2010–056. CNMNC Newsletter No. 7, February 2010, page 30; Mineralogical Magazine, 75, 27–31.
• Pekov, I. V., Chukanov, N. V., Zadov, A. E., Voudouris, P., Magganas, A., Katerinopoulos, A. (2011): Agardite-(Nd), NdCu₆(AsO₄)₃(OH)₆·3H₂O from the Hilarion Mine, Lavrion, Greece: mineral description and chemical relations with other members of the agardite-zálesíite solid-solution system. Journal of Geosciences, 56, 249–255.
• Ambrino, P., Brizio, P., Ciriotti, M. E., Finello, G., Marello, B. (2009). Minerali della pietra di Luserna. AMI. CD-ROM.
• Piccoli, G. C., Maletto, G., Bosio, P., Lombardo, B. (2007). Minerali del Piemonte e della Valle d'Aosta. Associazione Amici del Museo "F. Eusebio" Alba, Ed., Alba (Cuneo) 607 pp.
• Stara, P., Rizzo, R., Brizzi G., (1993): Sarrabus Miniere e Minerali. Edito a cura dell'EMSA e "varie associazioni mineralogiche", 208 pp.
• Stara, P., Rizzo, R., Tanca, G. A. (1996): Iglesiente e Arburese. Miniere e Minerali. Edito a cura dell'EMSA e "varie associazioni mineralogiche", Volume 2, 192 pp.
• Olmi F., Sabelli C., Santucci, A., Brizzi, G. (1995): I silicati e i vanadati di Ozieri (SS). Rivista Mineralogica Italiana, 2/1995, 145–160.
• Vecchi, F., Rocchetti, I., Gentile, P. (2013): Die Mineralien des Granits von Predazzo, Provinz Trient, Italien. Mineralien-Welt, 24(6), 98–117.
• Ricordo di Cristel Puecher da Roveda; F. Maiello, P. Ferretti; 2009*Rocchetti I., Gentile P. and Ferretti P. (2012): La Miniera di Frattasecca presso Malga Broi (Novaledo, Trentino-Alto Adige). Storia e nuove segnalazioni mineralogiche. Studi Trentini di Scienze Naturali, 92, p. 167–180.
• Bortolozzi G., Blass G., Boscardin M., Rocchetti I. and Ferretti P. (2013): La Miniera di Cinquevalli (Valsugana, Trentino-Alto Adige): aggiornamento sulle specie accertate negli ultimi anni. Studi Trent. Sci. Nat., 93, p. 149–165.
• Paolo Gasparetto, Erica Bittarello, Andrea Canal, Lara Casagrande, Marco E. Ciriotti, Bruno Fassina, Paolo Ferretti, Sergio Pegoraro, Fabio Tosato, Paolo Zammatteo (2014): I lavori minerari del Rio Ricet, Vignola, Falesina, Trento. Micro, 12, 50–123.
• Senesi, F. & Sabelli, C. (1999): Gli arseniati degli antichi scavi di Valle S. Caterina (Campiglia Marittima). Rivista Mineralogica Italiana, 23(1), 51–55.
• The Mineral Species of Japan (5th ed) Matsubara.
• Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.).
• Jimenez R., Joda L., Jorda R., Prado P. (2004) - Madrid: la mineria Metallica desde 1417 hasta nuestros dias. Bocamina, n°14, pp: 52–89.
• Tanago, J. G., Lozano, P. L., Larios, A., La Iglesia, A. (2012) Stokesite crystals from La Cabrera, Madrid, Spain. Mineralogical Record 43: 499–508.
• Collection of the Geominero Museum of Madrid; Tanago, J. G., Lozano, P. L., Larios, A., La Iglesia, A. (2012) Stokesite crystals from La Cabrera, Madrid, Spain. Mineralogical Record 43: 499–508.
• Meisser, N. (2012): La minéralogie de l'uranium dans le massif des Aiguilles Rouges. Matér. Géol. Suisse, Sér. géotech. 96, 183 p.
• Embrey & Symes, 1987, 40 – "Minerals of Cornwall and Devon"]; Peter G. Embrey (1978) Fourth Supplementary List of British Minerals. Mineralogical Magazine 42: 169–177.
• Cooper & Stanley, 1990, 76 – "Minerals of the English Lake district".
• Schultenite: Symes, R.F., Wirth, M., Mineral Mag. (1990), 54, p. 659.
• Mineralien Welt 1/93:44.
• Rocks & Minerals 83:1 pp. 65–69.
• NBMG Spec. Pub. 31 Minerals of Nevada; Rocks & Minerals (2010) 85: 512–524.
• Jensen, M. (1993): Update on the mineralogy of the Majuba Hill mine, Pershing County. Mineralogical Record. 24, 171–180.
• Natural History Museum Vienna collection; Jensen, M. (1993): Update on the mineralogy of the Majuba Hill mine, Pershing County. Mineralogical Record. 24, 171–180.
• R&M 77:5 p. 298–305.
• Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 4, 2000.
• Northrop, Minerals of New Mexico, 3rd Rev. Ed., 1996.
• Micro Probe Volume VI Number 8; Rocks and Minerals, 66:6, p. 453.

External links

• RRUFF Project